I'll take a guess and say that the developed camping sites around there will be open that week. But that's only a guess as all my camping is primitive camping and I generally bypass the area due to crowds (keep in mind that to me, "crowds" means I can see or hear people). Those reservoirs are around 5k feet and I think they try and open at least a few camp sites as soon as they can. I'm planning on camping as far and high as my Subaru will take me in a few weeks and might end up scouting that area (camp around Loon Lake and see how far snow shoes can get me into Desolation?), if I do, I'll post back with some beta.